Single and double storey extensions in Wembley. Trusted, professional, 30+ years' hands-on experience.
GS Renovation designs and builds extensions across Wembley, tailored to the 1930s and interwar semis that dominate HA9. With over 30 years of building experience in Brent, we take on rear, side-return and wrap-around projects, using the generous plots these suburban houses enjoy to add genuine, well-built living space rather than a cramped box on the back.

The wide plots and side passages of Wembley's interwar semis lend themselves to side-return and wrap-around extensions that many tighter London terraces cannot manage. A typical HA9 project extends the kitchen into the side alley and out to the rear, creating an open-plan kitchen-diner that opens onto the back garden. We dig and pour the foundations to the depth building control requires, allowing for any nearby trees on these leafier suburban plots, then build up in matching brick or render.
Steel beams carry the old rear wall once the opening is formed, and we tie the new roof, whether a flat roof with lantern or a pitched addition, into the existing 1930s structure. Because these are semi-detached pairs, a party wall notice to the adjoining owner is usually part of the process. We manage the groundworks, the steel, the roof and the weathertight shell as a continuous sequence.
Whether your Wembley extension is permitted development or needs a full planning application depends on the property and how far you go. Many single-storey rear extensions on these interwar plots fall under permitted development, but double-storey work, anything close to a boundary, or a home already extended will often need permission from Brent Council. We assess your specific house honestly and, where required, help prepare and submit the planning application rather than leaving you to guess.
Every extension, whatever its planning route, must meet building regulations. Brent building control inspects the foundations, the damp proofing, the steelwork, insulation and drainage at set stages. We book these inspections and keep the paperwork straight so your completion certificate arrives cleanly. From first sketch to the final fit-out of kitchen, bathroom, plastering and decoration, one team runs the whole job across HA9.
Homeowners in Wembley choose GS Renovation because we know how to use the generous interwar plot without falling foul of Brent Council or the party wall rules that come with semi-detached houses. With 30+ years locally, we handle foundations, steel, roof and fit-out under one roof, and we tell you straight whether you need planning permission.
Very friendly and I am very pleased with the work he has done, also very clean worker and enthusiastic about his work. Can not fault this company!!!!…
George was very friendly and helpful from start to finish. He worked really hard to ensure our kitchen was installed to a high standard and was…
Really happy with the quality of remedial works carried out by George in putting other previous tradesman work right. He was very helpful, honest and…
FAQ
Only if it covers the same work, and usually it does not. A low house extensions figure for a Wembley home normally excludes the engineer, the Brent Council application or the making good, all of which still have to be paid for at the HA9 property. GS Renovation itemises so the comparison is honest. Ask the cheaper Brent quotation for the same breakdown. Ring 07472 424 226 and GS Renovation will go through both Wembley quotations with you. As a rough guide, house extensions in London typically starts from roughly £40,000 for a single-storey rear extension and rises with size and specification (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
Fewer at once than you might expect, by design. Stacking trades into an HA9 property makes a house extensions job feel busy while achieving very little, so GS Renovation sequences them and keeps the Wembley site workable. You always know who is due and when. The programme issued with the Brent quotation names each stage and each week. The Wembley programme names who is coming to the HA9 property in each Brent week.
Read them before you speak to us, ideally. The MyBuilder reviews describe how house extensions projects actually ran, which is more useful to a Wembley homeowner than any claim we could make about the HA9 job. GS Renovation holds a 4.9 rating across 31 reviews. We will supply addresses too, so you can look at finished Brent work. Email info@gsrenovationltd.co.uk for details. Ask for HA9 addresses and visit a finished Brent job.
For a single-storey rear extension, commonly 3 metres on a terraced or semi-detached house and 4 on a detached one, with a larger allowance available under prior approval. Those rights are withdrawn in conservation areas and where Article 4 applies, so we confirm your HA9 status with Brent Council.
Not if the work is planned around them, which is what we do. Cornice, fireplaces, sash windows and original floors at an HA9 property are identified before house extensions begins, and GS Renovation agrees with you which are being retained. Protection goes up before any structural work starts. Reinstatement afterwards is matched rather than approximated in the Wembley house. GS Renovation will explain how house extensions protects original detail at an HA9 address in Wembley.
It depends on your house. Many single-storey rear extensions on Wembley's interwar plots qualify as permitted development, but a double-storey addition, work near the boundary, or a previously extended home usually needs a planning application to Brent Council. Either way, building regulations always apply. We assess your specific HA9 property and handle any planning submission needed.
Both are covered, and often in the same week. GS Renovation is usually on more than one Brent site at a time, which is why house extensions in Willesden or Wembley can normally be surveyed quickly. There is no travel surcharge between them. Email info@gsrenovationltd.co.uk with the HA9 postcode and we will book a visit. Quotes are free and carry no obligation. Aftercare reaches both addresses from the same team across Brent.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Wembley. Explore what else we do locally:
Same Service, Nearby Areas
We carry out house extensions across Wembley and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for house extensions in Wembley. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.